Casino winnings are fully taxable and can bump you into a higher tax bracket. How much you win determines how you're taxed. The casino will take 24% of larger winnings for the IRS before paying you your lump sum.
Longevity is an excellent indicator, and Europa Casino, established in 2003, certainly qualifies. With more than a decade of experience behind it, you can sign up with the confidence that the games are fair and that you will have no problem getting paid when you win.